Tape transmitter



Sept. 14, 1943.

L. M. FoTTs 2,329,217

TAPE TRANSMITTER Filed Nov. '7, 1940 2 Sheet-Sheet l /L\ ENTO l INV K Louls M. PoTTs a 3%? SATTO EY.

Sept. 14, 1943. L. M. PoT'rs Y 2,329,217

I TAPE TRANSMITTER Filed Nov. 7, 1940 2 Sheets-Sheet 2 FIGA INVENTOR. Lows M. PoTTs i is a side elevational View of aperforated-tape controlled transmitterV unit having embodiedtherein certain features of the present invention;VV

Fig. 2 is a transverse sectional view taken approximately'on line 2 2 of Fig. l and illustrating the distributor shaft in one possible condition of operation; .i

Fig. 3 is a view similarto Fig. 2 illustrating a different condition of operation;

-i Fig. 4 is a fragmentary end elevation ofthe" apparatus broken away;y

Fig., 5 is a diagrammatic sketch' of a modiiied systemzoi operationf power driving train with certain parts ofthe Fig. G isa diagrammatic detail view of a further modied apparatus. having, embodied therei in certain elements of the present'inv'ention;

Fig. '7 is a diagrammatic circuit illustration of a tape perforator and transmitterl voperating in" accordance with vcertain improved embodimentsforming'partci the present invention; u

Fig. Sis adiagrainmatic timing chart' illus-- 'trating thenperiodicityjof certain mechanical functions in' the sltriwtural embodiment of Figs. l'to`4,and'i Fig. 9 isa detailed perspective view of "la por- Sl'eeve tOgthrWith its related Y tion of the vcam apparatus.

Attention isv new directed specifically to Figs. o

1 to 4 and 7 of the accompanying draW'ing's- Whereinfthe reference character` denotesa base 'plate of a transmitter apparatus upon whose `surface arez mounted fthree supporting naled within an alignment `offbearing apertures located in tliefre-.mes 12, i3', andv I4. rRotary motion originating withaprirne mover represented by the shaitmIG, Fig. l is imparted through the driving Worm |71 toa driven gear I8 secured to said shaft I5. Ifhe directionof retaf tion is clockwiseuasviewed in Figs. 2 to4, and

th'e driving clutch elementy |79 rbeing an integralA part of shaft I5 p'irtakes' of this rotation conf tinuously. l i f;

A driven clutchelement r2|, having an end surface radially serrated to cooperate with `a4 corresponding surface on driving clutch` element i9 receives, correspondingv rotary movement when released fromv its dormant position as illus'f Ytratedin Fig. 1 by the witl'idrawal of interfering armature 22 whose uprightextremity is normallyy spring urged tobe interposedin the pathof av declutching lug 23 which, by reasonj of its` inclined surface rst withdraws driven clutch element 2|, then by positive.engagementfwith the upright extremity off armature 22, holds the former member from `rotating with the driven element I9. Y Y

Armature 22 :maybe .withdrawn from interference with lug 23 upon thef'energization of tape slack controlled. magnet 24, see Fig. J1, in-

consequenceiof the release of a slack sensing arm 28 whence clutch element 2| is brought into engagement with element .19. x

Magnet 24 which controls armature 22 vis ener- Jgized over a circuit 2 5 except when this circuit is broken by the separationY of contactor 26 from its contact point'21. Contacter 26 is carried bysaid tape slack lever 28 pivoted at 29 and when*v theslack in'tape loop 3| exceedsa predetermined quantity arm 2S is permitted yto droop to., an exev tent which permits Contact blade 26 to engage its contact point 21. Upon the shortening of .tape loop 3|, however,` the lowermost extremity of arm 28 is engaged thereby, causing said arm to be rotated clockwise about pivot 29 until contactor 26 is separated' from contact point 21 at which time magnet 24 is deenergized permitting armature 22 to'be interposed into th'e path of clutch disengagement lug-23, as afore-stated.

The end ofy clutch driven member'ZI opposite its serrated face is formed with a tongue 32 receivable within a slot 33 in the flanged extremity of a camsleeve assembly 34, Fig. 1l Sleeve 34 Ycarries; a series of cams including ve cams indicated 35 to :i2-each4 of which is operative upon Van individual pairof transfer levers 4| and 42, ycam 43 which serves to place invariably a trans- `rnitting contact into stop position at the conclusion'ofa signal cycle, cam 44 which serves to invariablyplace the transmitting contact into spacingposition at the start of a signal cycle, cam 45 which during-a given period' in thecycle through the` agency of its transverse bail 46 serves tofwithdraw a set of feele'r levers 58 from the perforated strip, and cam 41'which lthrough bell crank lever IDI moves aQfeelerlever'gui'de pinl 49 steadily 'forward during 'the time' that `any of the set of f'eeler pin'sfareextending into thev strip'.

, Havingjtnus itroaucedacngei the' cams car of the signal'curvellig. 8, during consecutivey signals, line'be-b ofone signal coincides with the line a-a oft-he succeeding signala Curve {5|- of Fig. 8 represents' a` typical signal.. Vin which stop cur-rent is of a predetermined marking, polarity, start current isofl a' predetermined polarity different from thatof stopvcurrent fand the ve signal intervals designated I,

2,13, Land v5 may, yof coursegbe,constitutedcfA any permutable arrangement of: `marking and spacing current. The illustration of 'FigaS con templates alternateychanges :during successive signal int'ervalsof.,y the code signal for'the sake of facile illustration'. I i

Curve 5| portrays.y the actionof a contacter 52,

Fig. 4, which iscarried upon'a bracket 53 inte-L horizontal. barl 54 with' the selector gral through bail 55. Y. c

Contactor 52 may fluctuate' between a pair ofA contact pointscrews `Stand yf51 eachassociatd with an individual current characteristicsuch as.

plus,y minus orA zero current. To accord;` 'with standard practice; contact screw 51 willbe con'- rnected with marking or plus current while' contactor 56 will lbe connected,l to 11o-current.v 1

As -has `been said, the behavior Vof contaetorrj52- yduring the start and stop impulses of each signal, as portrayed for example by; curve 5I, isinvariable but Iits behavior-,with4 respect to the iive codecombination signal impulses will'vary in accordance with the positioning ora setoinvetape feeler levers 58.1' Feeler levers 58, asfpertrayed formgysuch as`a perforated'tape.

iniFigs'. 2 andy 3, are all ofv identical contour. Eachcarries at its uppermost extremity afeeler pin 59 f of small diameter so as to be easily ad-i mitted'into the code perforations of a control Each feeler lever bodyJhas .an elongated hole I through which passes the: anchor pin or shaft 62 which determines the extent and to some degreethe direction in which each lever .58.may be moved. AAnother shaft pas'sing transversely through the several feeler levers as does shaft 62 is also) located in anV elongated slot designated'63 in the several feeler leversy 58; arrangedin parallel relationship and rin a generally longitudinal direction with respectto the y feelers, it will be understood that pin 49 willin no Wise restrict the-'vertical motion of the feeler levers 58 but will restrict said leversaagaipstrotation about shaft 52 as a center.

Zin-addition to the aforedescribed appurtenances y each feeler lever is also provided with va sidefwardly extending shoulder lug 64 across thetop of which there is disposed .the transverse resto- Since elongated slots 6I yand 53 are the cooperating; ;shoulder ll'Ix'Isofa-the'associated'.v y

transfer 'lever Y 421. .Accordinglig;depending lponl' the position v`offeachfeeler,vlever..f58,, one orj the other y'oi-'each pair of itransferelevers 41.-;4421fwi1l1 be permittedfto rotate-f'counterclockwise1.about the common. pivot 'I'to the'exclusion oi'thefoth'er Whileiselecto'rleversfM rand 42 substantially different yin contour i they'resem'ble Yeach other, neverthelessgthroughout.a brief..` ine termediatelportion and particularly in the .proximity of their followerprojections 'If9.`.\ nmliactf the projections 'I9 of all'levers 4I andiZvar'e' thesamev longitudinal;`- alignment and'- .eachipair relatingto Aafset `offl'evers 4 I and Mais designed to` rest up'onLtheperiphery of a particular one offtheset ofve,distributorCanis y :to 59,! The cony ration bail 25, mentioned above. The lowernisi'.

extremity of. each feeler lever comprises vazplatef sectionlindicated 55 directed leftwardly as viewed on Figs. 2 'and 3, and each said plate section is provided with right angular abutment shoulders 65 and 61. An individual spring 5t connected between an ear formation in each Vlever 58,'a'ncl an anchor bracket 5S urges each one of said le-V vers 58 :upwardly but during va, briefinte'rvall of each cycle all of the feeler levers are restrained'v against the influence of their several .springs GB, that is, when bail i5, a part of a lever 48 is urged tour of `the several camsA `35 vto 3'9, inclusiveg 'i identicallandfis 'as-indicated in-fFigsi-Zarid i However, the severalc'ams i35 to 39 lar'esucc'es Vsively :displaced e'achfv froniftli'ei other by "'a' con# stant-'angular progression'. Accordingly, the'sev'-V eral cams are so arranged that the dwell'sorlo'w portions 8|.v in their peripheriesoccur successively at any particular"point as Ithe ycam-fassernblyi 34 is rotated by the clutchyel'einentsgl S51-2|; At a-n--assignedfintervallin the-slective cycle',V

` eachparticular oneof the cams 35 to39 vwill predownwardly depressing all of the feeler lever,

lugs Bil, as indicated in Fig. 2.

ll5. f

The period during each cycle when thedepression incam l5 becomes effective to permit all oi the jfeeler levers 53ste risey is indicated byV the horizontal portion of curve 12, see Fig. 8. The

brief 'interval during which the VJieeler levers are depressed or withdrawn is represented by the comparatively short peak insaid curve l2; When freed by the lifting of .bail bar '15 each of the several feeler levers 53 seeks to rise to an upper level such as indicated in Fig. 3. This extent of movement is permitted only when a perforation is encountered in the tape which passes between' the/guide platesflll and l5. Whenthe feeler projection 55, encounters no perforatio-n'in the tape', v y l bya spring 89 incounterclockwise direction-about however, a particular lever, 56, will be permitted to rise only until its upperextremity encounters the surface of the tape in whichv case it will as sume a position approximately such as that i1-l l v One end of lever' 48 terminates with a cam follower projection 'Il whichvrides the periphery of aforedescribed cam sent itsnadir or low "portionl to its'` associated `pair of transferlevers fII-I---llZ-LAIV -Since'for each impulse ybutY one rif-said twolevers `III and 4 2V may beftree'with respect to the interfering shoulders" 66 and? 67 'ofv its associated feeler -le-'Ver portion:

' 65; that f particular one ofk 'said pair'fof 'levers 4I-42 will bfi-"permitted to rotatecount'ercloclry wise about p'ivot'l'l underthe iniluenceloiits individual spring`82 Lv'or-"'83 andlasa result "will y cause to` loe-.engaged its'correspondi-Iig one Jvof the? edge 84. is engaged byts lever-4|',vthev bail-"555 will be' rotated clockwise about pivot; causing its latching projection V86' to be moved v`to'y the uppermost 'of thedeten't notches `in datent lever 81. f Onthelother hand, if-the lowerm'osi-,baill edge 85 is engaged by' its associated lever II`2', bail 55 willbei rotated counterclockwise about pivot-v 88 causing 'detent'pro'jection to register and`` be engagea in uieiowermostrof tneidt-entnotenes y of detent pawl' B'IJYThe latter member is vurged" itsr positions as 'determined byone or `the other of the previously operatedf leversqlll orfllliine which" position saidbail will continuey until sition f romisaid previously operated one Vofsaid` topreviously, when projection 59 extends through f the tape, is commonly termed marking while the other, when projection 59 is'Y blocked by the tape, is: referred to as spacing. This classifican tion `is in conformity with the sameterminology as before applied to line signals of vcurrent and rio-current polarity. When a feeler lever 58 is inA its marking position, shoulder 166 of vits lowermost extremity will be presented in the position illustrated in Fig. 3, whereat it'block's the vcoope'ry yating shoulderV 'i5 of the class of transmitting levers. lItis tobeunderstood that;theforce fof either one of the `springs, '82 or,83`=.issuflicientto over-comethe effeotofasaid deteni;l spring -89- bail transfer leverspdesignated lil, while 'shoul.

der 6l ofthe plate 55 is sufciently .raised so las to clear shoulder fll -of lever 42;,asbest-z-illusso that uponth'e yopera'tionof onelo'r they other of *said levers A4I ori 425,:1the retaining projection A86 `may :be .moved quickly. in va'corresponding Since'but--onef each' `pair'lof levers-4 I .andi-42 K may ltieoperatecl` to? the vexclus'ionof the other* 52 as influenced i byg :thegfluctuations :fof f bail f5 5.;

which vin .turn is dependent lupon the Ioperation ofsaid. set of pairs of levers .4:l and 42.r

Although in the .operation of the instant disclosedapparatus there is contemplated the customar-y intermittent motionY on the part of a set of feeler levers 58 as in the case of conven-v tional tape ltransmitter mechanism, a novel practice and a means for kits execution is proposed InFig. `1 the reference character 4|a denotes a' special transfer lever resembling in.contour the `class of levers 4| of which one is .associated with 4each cam .35 to 39, as aforo-described. Corherewith inthe use .of a non-intermittent-l or `continuously moving tape in conjunction with said intermittent feeler levers 158;. It will be noted that a driving gear 9|, Fig. 4, is .formed as a part of assembly .34. This element meshes with a larger driven gear 92 which .together with an integrally associated driving pinion 931s carried upon an idler sha-ft S4. Driving pinion `93 meshes with a driven pinion. whose shaft 36 extends transverselyacross the tape sensing apparatus and has fastened to it thesprocket feed 91. So long as themotion of yassembly sleeve 34 is sustained and continuous, the motion vof shaft 96 is sustained and continuous. Accordingly, since Ytape feed sprocket 91 is an .integral part of sha-ft ,96, the motion .of the tape as induced by the teeth of sprocket wheel -91 vis correspond. ingly even and sustained in contradist-inction tov the conventional interniitterrtr or step-by-.step

movement.

The sprocket -teeth of wheel `95| areV adapted to t into perforations customarily provided in the approximate longitudinal center of .a control strip for the` 'purpose of advancingthe strip both during preparation and subsequently during iits use as a. control medium. `rSince the tape .feelers 59 extend into the perforations .of theta-pe during a substantial period of .each sisnalrcvcle .and-.since the tape is continuously n motion .during this period, `means have been provided for positively moving vthe feeler levers 58 in threesome. directicnuV v as that in which the tape is :moving and .at sul)F .l stantiallyV the 4same rate of movement: :so thaty relative alignment is positively maintained .bee tween the vfeeler lever pins andthe code perforationsln' the tape.

To understand .how this is accomplished, rcierence will .again be .directed :to the. feeler lever` alignment pin 4.9 mentioned above. @in which .passes through the slot 6.3. of the .several feeler ,levers-581 is anchored in ay bell .crank lever` designated lill. The vertical arm ofloellcrank lever l lll carries the aforementioned pin land Y to it istied one, end olla. tension .spring 192. .the

other terminal of which isallchorel'- ttl/the "frame work of the apparatus. Accordingly.. sphinx |02 urges counterclockwise rotation tolaell crankv ID l.

causing it to seek tosrotatebout its pivot |03.4 such .rotation may advance only until the .iol-j lower fnose |54 which is formed withv other arm of .bellcrank |01 engages theperiphery ofv aforo-,described cam .41, theeontour .of whichis suchV as to induce a movement on the partei bell -crank 10| to correspond with the'curve. m5

indicated in F18. "B, .From this itwill Ahe underlstood that lthe motion oftheseveral feeler levers 58 during theiive impulse'intervals lof anode eration .of hail 46, .as portrayed by :curvev 1110i.

Fig. '8, .they are forthwithznetumed from anpe;

sitiocn .as indicated :approximately Vin Fig. .fftof one such as indicated'appmxlmately inlFigfZ.

respondingly,lthe reference character. 42a denotes Ia special transfer leverresembling in contour the general class of levers 42, At an interval during .each signal cycle preceding the ve impulseintervals of the code combination cam 44 presents its recess to the projection 19 of lever4|a causing said lever to engage edge 84 of the contact operating bail so that it is rocked clockwise, Figs. 2 and 3.' As a result contacter 52 engages point 56and a spacing or start irnpulse is vinvariably produced. Thereafter fol low the five code impulses and then cam 43 presents its drop-o to lever 42a causingthe latter to rotatethe contact bail counterclockwise. This moves conta-eter A52 into engagement with point 51 causngha marking or stop impulses to be generated. In this way levers 4|a and 42aoperate invariablytoproduce the essential phasing (start4 and stop) impulses of the system.

- Having explained the performance of each oneof the Vearns 35 to 35, 43 and 44, inclusive, inconnection with their individual functions of determining .the operative instants of levers 4|, 42, 4|a, and 42a, attention is now directed to the vcurve |||J, Fig. 8. Here there is represented Alcy the sharp saw tooth portions of the curve the instants voi occurrence of each .of said cam drop-offs, and by comparing this curve :with the one indicated 5| it will be observed that the length of eachjsignal impulse or component is determined by the distance from one cam .dropoiT to a succeeding one, Thus, while conventional types of cam operated transmitting appa ratusv depends for accurate signal reproduction upon the full contour of their controlling cams, the instant apparatus depends solely upon the location of each cam drop-off and not uponthe further characteristics of each cam contour.

. A principal feature of novelty which is disclosed in the foregoing preferred embodiment isl one which may find application in printing telegraph apparatus other than tape controlled transmitters. To illustrate, attention is directed to the disclosure of a single magnet controlled selector mechanism in Fig. 5. yHere a shaft which carries the cam assembly is'indicated |5| while against the periphery` of the cams there may be observed a set of bell crank levers disposed in pairs which are indicated |52 and |53. Individual power springs |54 tend to rotate levers |52 and |53 of each pair in a counterclockwise direction about their common pivot |55. Through the intervention of an armature |56, which is controlled by the line signals that are impressed upon magnet |57, 'oell crank lever |52 or |53 may be individually selected upon the occurrence of the notch |58 in alignment with itsprobing projection |59. As in the case of the' preferred embodiment, it will be recalled that but one of the two levers may lloe selected in response to any particular signal impulse and that the `other of each pair is 'thereby excluded from selection.

. When one or the other of the bell cranks |52 or i|53 is rotated by its power spring |54, the projection |6| or |52 of the opposite end of said bell crank will, accordingly, shift a lever |63 which is pivoted at |64 and which is detented by element |55 to accordingly position its associated selector bar |63. The manner in which a set of 'selector'. bars' |66 accomplish the function of'selectionformsno parftof the presentin- 4whichis pivoted on` a common shaft ISI.

bar |18 is provided with two tie pins |82 between which the lowermost arm of its lever |19 extends ventionf-'ad' accordingly I reference thereto is deemed unnecessary. y Reference -ma'y be had` to U..-.S.'Patent No. 1,884,807 foranunderstanding tion may be applied.

Fig.'5follows essentially the='timing sand general arrangementk ofthe. principal embodiment 'disclosed inFigs.` 1 to: 3,inclusive. :The vnotches of the several camsliare' arranged in a spiral progression and the rotation` 'of shaftA ISI isreg- 'ulated toxsynchronize withrthe iiuctuations of, a

line' magnet armature I|53 aslis. Well known in the practice of printing.:telegrap'lfiv apparatus. As armature |56 fluctuates'itt mayv be positioned 'toblock either Ione of the'apair fof bell cranks |52 or |53 so the other. :one o fsaid pair through its projection IGI or |62 rocks v.its associated seto the urge of its powersprin'gfllland rotate fcounterclockwise about pivot1I81`. IThis will corf vIn its loperation ,the embodiment disclosedin :contacting:member-19229 signaling 'condition disengage the other of .its associated pair of contact points |93 and ISflf-f" D `Acoiding1y,i rthere' :willbe installed Aupon' the representative of its associatedkeyboard bar' |18. i As shaft I1I `rotates and theA several camsl |12 are t successively brought into" alignment with the corresponding lugs |36 of theirpairsfoflevers |13 f `andHlI so, todi-Will the signaling impulses ofthe `complete signal be installed upon thecontactor |92 inthe manner inf-which it engages one or the s 0- other of its associatedcontact points I93'and IS. .2

lector bar |66 to the. right orv to the left and,"`

there beingaset of said'y bars ISS to loe-permutably positioned, the result of a cycle ofv ope .eration of yshaft I5Ifis Vthe corresponding posi-A tioning of` a'set, of- 4code bars |56. Ultimately the .notches in said several bars |65 are disposedr'to present a selection to a transverse barr 'in a .manner well known lving printingA telegraph apparatus.. y i

vkIn Fig. 6 thereis illustrated a furthermodi.- `cation V,of theA presentl invention featuring the application of certain essential novel principles .in la .directy keyboard telegraphftransmitter. ,Here the cyclically controlled transmitting's'haft lis designated I1I. It carries a spirallyfarr'anged While the present invention has been'explained lan-ddescribed with reference to, certain specific ofthe' accompanying drawings nor to the particulars of the foregoing detailed specication except as indicated-.in the hereinafter appended claims.

- What is .claimed is:

1. In a'tapetransmitting apparatus, a pair of linecontacts, a plurality of pairs ofcontiguous y bars :each pair associated with animpulse of a succession of recessedcamsfgrepresented bythe foremost one, indicated |12., Each of said cams isadapted to serve a pair of transfer =leversdese ignated I13andI-14., i*

The levers |13 and |14 in this case,l as in the preceding example of bell cranks, extend one farther than the other. asindicated at-l15 and |15.. :Apower spring |11 individualto Leach'one of said levers |13 and |14 tends to `rotate'i't'in a permutation code,r a 'plurality of power driven cams leach associated with oneo-f said'pairs of bars to simultaneously condition'said bars of each pair, supervisory means for blockingl one of the bars of `each pairto permit-.the .other solely to Vrespond to their vcommon camgand means includingsaid singlefpair of contacts for generating line signals under thecontrol of said pairs of bars., 2. @In a tapetrfansmitting apparatus, a plurality of pairs of-"parallellyacting elementshaving a counterclockwisel direction as indicated. The

keyboard apparatus is denoted by thegrepresentative bar I18of whichthereecustonjlarilyefare provl vided a set of five (in a five code system), and

a universal bar which is invariably operated upon the depression of any.. key lever to start the distributor-into rotation, eachn bar |18 havingr associated with it an individual ysetting lever 11S Each while the upper end of lever |19 is providedr with a pair ofsoverhanging'lugs |83 and |84. Following each keyboard operation, i. e., the depression o-f a key lever, a locking knife 2053 is caused to descend upon one side or the other 01"' the several uppermost projections Hill of said levers |19 holding them securein their set position while the code transfer is completed aswill now'be explained.v

The spread of said lugs |83 and |84 is such that one or the other of them may overlie the corresponding projections |15 or |16 of lever pairs |13 and |14. By thus overlying the extremity of one' or the other of saidbellcrank levers that one is prevented from responding to its associated power spring |11 when during the course of travel of the cam assembly its associated cam I12'prese'nts its dwell or recessed portion to said lever opposite its lug |85. The ,one ofsaid pairs of selectable supervisiont by said associated cam, and means kfon4 generating line",t signals runder; thecontrolv` of said pairs of elementsrotatableabout the same pivotal axis. j

3. In a transmitting apparatuspa'series-ofpairs of bars associated with correspondingcomponents of a permutation code, a power driven cam asso.

vciatedwith each one of said pairs of bars, means i to select one bar and block the -other bar of each pair of bars for movementunder the supervision of its lsaid associated cam, and means for generating permutation code line signals under the control of conditioned bars of said pairs of bars.

4, ,In a .printing telegraphv selectorinechanism, a series of pairs of code transfer elements,'1neans to blockone and condition another one of each .pair of said code transfer elements for effective operation, apparatus to present a path for movee ment to each pair of said transfer elements successively, and contacts for generating line impulses in accordance with the operation of. the one of ysaid transfer elements'of each pairwhichis conditionedby said means. 1 l f 5. In a printing telegraph selector echanism, a series of pairs of transfer elements, signal conleversll'1'3 and |14 whichfi's not obstructedl'by an I one of said transfer elements which thus is conditioned; s

6. In a printing telegraphsel'ector mechanism, a plurality of pairs of codetransfer elements, impulse supervised means to condition one of each pair of said code transferelements for eiiective cperationmeans to present successively`a single clearance for movement to 'each pair of said transfer elements,y andV means for generating line impulsesin accordancerwith the operation` of said conditioned transfer elements of each pair according to said single clearance presenting means by one of the elements of each pair of elements n being selected successively. q y

7. In a code telegraph system, a. tape trans mitten a cyclically'rotatable shaft 'in' said tape transmitter; apair of line contacts, and apparatus for operating said line vcontacts in accordance With the perforations' in a tape comprising a set of feeler levers, a set of pairs of Contact conditioning levers, each pair associated withV one of said feeler levers, and camfmeans carried by said cyclically operating shaft forrpermitting` each of f' said pair of conditioning levers toassumea position in accordance With its asscciatedone of said set of feeler levers.

8. In a signal transmission system, a signal generating contact pair, mechanism for operating .saidcontact pair, a plurality of pairs of supervisory impulse transfer leversffor conditioning said mechanism, the levers of each of said pairs being parallelly rotatable about a common shaft, perforated-tape controlled means 'for selecting of each pair of said levers one to operate said mechanism, and a, control shaft having a plurality of cams each corresponding to'iand presenting a permissive clearance concurrentlyy to a pair of said leversfor appropriatinglla. cycle interval to '10. A permutation code `selector apparatus comprising, a series of pairs of signal.V component transfer means, a cyclically operated device for permitting each pair of; satd transfer means to vmove intok effective position for operation-r and a supervisory element associated withY each pair of said' series for blocking one of said pairs against effective operation.

' 11. In a keyboard controliedapparatua. a series of code bars,`a-y corresponding series, of parallell-y acting pairs oftransfer elementsxpivctect about a common pivotal axis, means, under the control' of each code bar of. saidv series'for enabling one of said pairs of transfenelements, a. cyclicallyy operated device for conditioning: eachf pair of said transfer elements successively and parallelly about the said common pivotal axis, anclan apparatus` common to said' series' of pairs of transfer elements: and responsive only' to the operation of conditioned transfer elements.

12. In a keyboard apparatus, aseriesA ofpairs of transfer elements, a cyclical'ly operatedV device for conditioning each pairot said transfer elements successively, meansto block one element. of each pairunder the control. of a' keyboard manipulation, and a response apparatus operated the unblocked: oneV oi each pair during its cyclic conditioning. Y

13. In a start-stop telegraph system, a transmitter apparatus comprising a series of cams, certain of said camsrelatingto components of a code combination signal, pairs of levers associ'ated with said cams, certain other-or saidy cams yrelating to the pnasingvcomponents of a code said levers during anindividual subsequent instant, meansN to control the operation of said signal generating contactmeans'by means of said levers during the release portion of said cams and independently of" said restoring portions of said cams.

' LOUIS M. P OTTS. 

